Yarn-guiding device for coil-winding machines



s. FURST 3,136,495

YARN-summa DEVICE FOR COIL-WINDING MACHINES June 9, 1964 5 Sheets-Sheet 1 Filed July 13, 1962 T 5 PDM wf 5M yf s. FURST 3,136,495

YARN-GUIDING DEVICE FOR COIL-WINDING MACHINES 3 Sheets-Sheet 2 June 9, 1964 Filed July 15, 1962 d H Q Q QQ Q K+ -lxf QQ QQ /J June 9, 1964 s. FURST 3,136,495

YARN-GUIDING DEVICE FOR COIL-WINDING MACHINES Filed July 15, 1962 5 Sheets-Sheet 3 United States Patent 3,136,495 YAItN-GUEBENG DEVICE FR CILWINUENG MAC ES Stefan Frst, Manchen-Gladbach, Germany, assigner to Walter Reiners, Monchen-Giadhach, Germany Filed .lniy 13, 1962, Ser. No. 269,702 Claims priority, application Germany lady l5, 1961 8 Claims. (Cl. 242-432) My invention relates to machines for winding yarn from bobbins, cops or other yarn-supply coils onto a takeup spool to produce yarn packages of a type, size and shape desired for further fabrication. In a more particular aspect, my invention concerns yarn-winding machines in which the yarn is guided onto the take-up spool by a rotating yarn guide or drum of generally cylindrical configuration, which has a guiding groove extending about the drum periphery and along the yarn package to be wound and forming a curve closed upon itself in order to guide and reciprocate the oncoming yarn back and forth along the yarn package being wound.

if the yarn arriving at the rotary guide is severed intentionally or by faults or accidents, the length of yarn connected with the take-up spool continues running onto the spool due to the momentum of the spool. However, since now the yarn is no longer under tension, it can fling sidewise under its own inertia. The tendency of such sidewise motion is the greater, lthe farther the yarn end has passed from the center toward the right or left of the yarn guide at the moment of yarn breakage. As a result, the yarn end, when being wound up, no longer places itself firmly upon the peripheral surface of the take-up spool but may lling beyond the lateral contines of the spool which practically coincide with the travelreversing points of the yarn-guiding groove. In this manner, a Wrap or ofi-loop may be formed beyond the lateral face of the take-up spool, and in some cases the yarn end is wound about the core ends of the spool. The removal of such lateral wraps is dii-heult and time-consuming, particularly in automatic cheese and cone winding machines because the action range of automatic yarnseelring devices, as a rule, is limited to the peripheral area of the spool. Manual attendance is then necessary for eliminating the disturbance.

Lateral loops and wraps may also occur occasionally during normal knotting operation upon depletion of a yarn-supply coil or upon elimination of stoppage due to yarn breakage. This is because after the respective two yarn ends from the supply coil and the take-up spool are knotted together and the winding station resumes its winding operation, a certain length of yarn must be wound upon the take-up spool before the yarn is again taut and under proper tension. During this initial interval, virtually the same phenomenon occurs as described above, because again the yarn is free of tension which tends to pull it toward the middle of the yarn-guiding drum. Consequently in such cases, too, the yarn may be ilung laterally out of the drum groove at the reciprocation reversing localities of the groove.

In order to minimize the occurrence of lateral loops and wraps subsequent to a knotting operation, it has been proposed to delay the ingress of the yarn into the drum groove so that the yarn becomes guided by the groove only after the yarn is under proper tension. To obtain such delayed entering of the yarn into the groove, the proposal has been made to' provide a zig-Zag gap ahead of the yarn-guiding drum with respect to the travel direction of the yarn being wound.

It is -an object of my invention, relating to yarn-package winding machines of the above-mentioned type, to provide a yarn-guiding device which more reliably prevents the occurrence of lateral loops and Wraps not only 3,l35,i Patented June 9, 1964 lCC upon occurrence of ltnotting or another specic condition but rather under any and all irregular operating conditions which, as mentioned above, may result in such trouble, and it is also an obiect of the invention to secure such universal protection with utmost simplicity of design, mounting and attendance.

According to my invention, the rotary yarn guide of cylindrical or drum shape in a package winding machine of the above-mentioned type is provided with normally stationary guide members which are located in front of axially adjacent portions of the yarn guide and cover the respective reversing localities of the guiding groove, beyond which localities any yarn end is not supposed to be flung. The two members are radially spaced from the rotary yarn guide at the front or yarn-entering side thereof and are provided with respective yarn-deflecting edges facing inwardly. The two detlector members, preferably consisting of arcuate sheet structures having projections which are mutually interposed with respect to each other and thereby also form a zig-zag gap in front of the middle portion of the rotary yarn guide.

The provision of such cover and guide members adjacent to the yarn-guiding drum has the result that any severed or broken yarn end is held in the groove and, because of its frictional contact with the inner surfaces of the cover members, cannot be readily flung out of the groove and laterally beyond the reversing points. The yarn-detlecting edges of the two members, facing eachother and directed toward the middle of the drum, guide any such yarn end in the direction toward the middle of the drum, thus additionally reducing any tendency of lateral loop or wrap formation.

Such lateral loops or wraps are prevented most reliably if, according to another feature of my invention, the cover members are given an inner arcuate surface closely adapted to the circular curvature of the yarn-guiding drum and if the cover members extend over the drum periphery up to the immediate vicinity of the line of engagement between the guiding drum and the take-up spool. It is further preferable to have the cover members extend axially from the lateral active ends of the guiding drum toward and beyond the middle of the drum, and to have them extend peripherally from close to the above-mentioned line of engagement to the geometric locus where the yarn, during its reciprocation, enters into the groove of the guiding drum.

The above-mentioned and more specific objects, advantages and features of my invention, said features being set forth with particularity in the claims annexed hereto, will be apparent from, and will be described in, the following with reference to the embodiments of yarn-guiding devices according to the invention illustrated by way of example on the accompanying drawings in which:

FIG. l is a sectional View of a rst embodiment, the section being taken along the line I-I in FIG. 2.

FIG. 2 is a front view of the device.

FIG. 3 is a sectional view of a second embodiment, the section being taken along the line III-III in FIG. 4.

FIG. 4 is a front View of the device according to FIG. 3.

FIG. 5 is another front view corresponding to FIGS. 2 and 4 but with the stationary cover members removed and the yarn-guiding drum in a different position of rotation; and

FIG. 6 is a fragmentary section taken along the line VI-VI in FIG. 5.

In all illustrations the same reference characters are applied to similar components respectively.

According to FIGS. 1 and 2, the illustrated yarn-guiding device comprises a guiding drum 1 whose shaft 2 is driven in the direction indicated by an arrow 3. During operation, the yarn, travelling on the path F, runs through Va guiding groove 4 of the drum 2 onto the take-up spool 7. rl`he guiding groove 4 extends helically about the peripheral surface of the drum and forms a curve closed upon itself which defines reversing points la and 4b (FIGS. 2, 5) near the respective axial ends ofthe drum. rlihe closed curve of the guiding groove intersects itself at points intermediate the two reversing localities. When during operation the shaft Z is driven at constant speed, the yarn package or spool 7 being wound rests under its own weight upon the peripheral surface of the guiding drum to be entrained thereby. Hence the take-up spool is driven at constant peripheral speed, while the yarn arriving at the spool is being guided by the groove d to reciprocate toward the right and left to build up a crosswound yarn package (called cheese) as shown.

In the illustrated embodiments the drum 1 is provided with additional, auxiliary grooves S and 6 (FIGS. 2, 5, 6) of which each extends only along part of the circumference of the drum. The auxiliary grooves are located predominantly within the spool-winding range deiine'd by the distance between the reversing points da and 4b. That is, the auxiliary grooves S and 6 protrude laterally only at their respective front portions 5a and 6a, if at all, beyond the reversing points. The auxiliary grooves 5 and 6 are located in an angular range substantially between one of the reversing points da, 4b and the next adjacent intersection point of the guiding groove l, as is best apparent from FIG. 5. Y

Mounted on each side of the yarn-guiding drum ll is a cover sheet l0, lila which is located in front of one of the respective reversing localities da, 4b. In the embodiment of FIGS. l, 2, the two sheet members lt) and lila are fastened to a pivot shaft lil which permits turning the sheetmembers from the illustrated normal position toward the observer, and thus away from the yarn-guiding drum.

As is best apparent from FlG. l, the shape of the cover `member l@ is adapted to the circular curvature of the guiding drum ll and is closely spaced therefrom radially over somewhat less than one-bali oi the circumference and up to the vicinity of the line of engagement l2 between guiding drum l and take-up spool 7. As a rule, the cover member must cover more than one-quarter of the drum circumference. f

As mentioned, the yarn end should be restrained by the cover sheet as soon as possible upon occurrence of conditions that involve the tendency of lateral loop or wrap formation. For that purpose, each cover sheet member lill, i011 extends in the direction of the shaft 2 from the axial end of the guiding drum toward the. middle 2) the cover sheet lll extends up to this line of the outermost yarn path. Y It will be seen from FIG. l that at this location the yarn just enters into the guiding groove at the moment when the reversing locality la of that groove is eiective to reverse the reciprocating motion of the yarn along the yarn package being'wound.

The cover sheet is further provided with a yarn-deilecting edge i3, 13a which is directed toward the drum middle orsymrnetry axis la. Each deflector edge I3, 13a deiines with the outermost yarn path F an angle a (FIG. 2) which in the illustrated embodiment is Vsubstantially equal to 45. This makes it possible that on the one hand the yarn can suiiiciently glide along the edge i3 but, on the other hand, receives a sufficient momentum and flinging motion in the direction toward the center line la.

At the points 13C and l3nt', the respective deflector edges of the cover members are curved to a hook-shaped configuration, the bight or opening of the hook being directed toward the oncoming yarn. It is preferable to have the bight points lSc and i3d located as high as feasible, i.e. close to the line of engagement l2 between guiding drum l and take-up spool 7.

The ends I4 and llt-a of the respective cover members l@ and 19a are provided with projections that are spaced from and interposed alternately with respect to each other in front of the middle portion of the drum so as to form a zigzag or meander gap of the type known as such. In the illustrated embodiment, these portions of the cover sheets consist of inserted pins l5 arranged in respective groups which straddle each other to form a labyrinth arrangement.

The embodiment illustrated in FIGS. '5 and 4 is essentially similar to that described above with reference to FIGS. l and 2 and diliers therefrom only in that the two cover sheets li) and lila are made of a single piece 5 of sheet material such as metal 0r plastic. As a result, the two cover members are integrally joined by a connecting bridge llib. The height of the connecting bridge liib up to its upperedge lilo is determined by the fact that this bridge must not irnpede the yarn as it enters into the guiding groove 4 and is being reciprocated by the groove along the take-up spool 7.

,The additional grooves 5 and 6 located axially beyond the guidingV groove 4 but essentially within the winding range determined by the distance between the reversing points da and 1lb are sometimes active to catch a yarn end laterally liung beyond the main groove, and to then return such yarn end back to the winding range, thus coacting with the guiding operation of the respective cover members lltl, lila. Por this purpose it is of advantage to give the outward wall 5c, 6c of the auxiliary groove greater steepness than the inward wall 5d, 6d, as is apparent from FiG. 6. It should be understood, however, that the provision of the auxiliary grooves 5 and 6 is optional because the main purpose and advantages of the invention do not always require the provision of such grooves, their additional coactive performance having been found appreciable only for some eases of yarn fabrication, for example for particular kinds of yarn.

Upon a study of this disclosure,it will be obvious to those skilled in the art that with respect to designs, material and details of arrangement, my invention permits of various modifications and hence can be given embodiments other than particularly illustrated and described herein, without departing from the essential fea- Vtures of my invention and within the scope of the claims annexed hereto.

I claim:

l. In a yarn-coil winding machine, a device for guiding the yarn onto the coil being wound, comprising a rotary yarn guide of generally cylindrical shape having a guiding groove extending peripherally about and axially along the cylindrical guide to reciprocate the oncoming yarn along the coil, said groove forming a curve closed upon itself and deiining two axially spaced reversing locations relative to the reciprocating yarn motion, two normally stationary members covering said respective reversing localities in front of said yarn guide relative to the yarn travel and being radially spaced from said yarn guide, said members having respective yarn deiiector edges facing each other and extending toward the middle portion of said yarn guide and being respectively provided with projections which are mutually interposed to jointly form a zigzag gap in front of said middle portion.

2. ln a yarn-coil winding machine, a device for guiding the yarn onto the coil being Wound, comprising a guiding drum rotatable about its axis and peripherally engageable by the coil being Wound, said drum having a yarn-guiding groove forming a curse closed upon itself about and axially along the peripheral drum surface for reciprocating the oncoming yarn along the coil being wound, said groove deiining two axially spaced reversing locations relative to the reciprocating yarn motion, two

normally stationary guide members having respective surfaces of arcuate shape covering said respective reversing localities in radially spaced relation thereto and extending approximately parallel to the drum periphery along part of said periphery and nearly up to the coil-engagement line of said drum, said members having respective yarn detlector edges facing each other and extending toward the middle portion of said yarn guide, and said two members being provided with alternately interposed projections jointly forming a zigzag gap in front of said middle portion.

3. In a yarn-guiding device according to claim 1, said two members extending substantially from the respective axial ends of said rotary yarn guide to the middleof said guide, and from close to the coil-adjacent location of said rotary yarn guide to approximately the path of the yarn entering said groove.

4. In a yarn-guiding device according to claim l, said yarn deector edges of said respective members having hook shape, the bight of each hook shape being situated between said middle portion and one of said respective reversing localities, and said bights facing the yarn-entering side of said groove.

5. In a yarn-coil winding machine, a device for guiding the yarn onto the coil being wound, comprising a rotary yarn guide of generally cylindrical shape having a guiding groove extending peripherally about and axially along the cylindrical shape to reciprocate the oncoming yarn along the coil, said groove forming a curve closed upon itself and defining two axially spaced reversing locations relative to the reciprocating yarn motion, two normally stationary sheet members covering said respective reversing localities in front of said yarn guide relative to the yarn travel and being radially spaced from said yarn guide, said members having respective yarn deiiector edges facing each other and extending toward the middle portion of said yarn guide, and said two members being provided with mutually interposed projections forming together a zigzag gap in front of said middle portion, and pivot means for said members having a pivot axis parallel to the axis of said rotary guide whereby said deflector members can be turned away from said rotary yarn guide. Y

6. In a yarn-guiding device according to claim l, said two members forming a single structural piece together with each other.

7. In a yarn-coil winding machine, a device for guiding the yarn onto the coil being wound, comprising a rotary yarn guide of generally cylindrical shape having a guiding groove extending peripherally about and axially along the cylindrical shape to reciprocate the oncoming yarn along the coil, said groove forming a curve closed upon itself and defining two axially spaced reversing locations relative to the reciprocating yarn motion, two normally stationary sheet members covering said respective reversing localities in front of said yarn guide relative to the yarn travel and being radially spaced from said yarn guide, said members having respective yarn deflector edges facing each other and extending toward the middle portion of said yarn guide, said two members being provided with a plurality of projection alternately interposed with one another and forming together a zigzag gap in front of said middle portion, and said rotary yarn guide having beneath each of said sheet members an auxiliary groove extending along part of the periphery only and situated in an angular intersectional portion of said guiding groove inwardly of the radial plane of one of said respective reversing locations.

8. In a yarn guiding device according to claim 1, said projections comprising pin-shaped parts extending from said members and disposed substantially parallel to and spaced from each other to form said zigzag gap.

Universal Winding Company, No. 44 Roto-Coner Parts Catalog, March 1946, page 73. 

1. IN A YARN-COIL WINDING MACHINE, A DEVICE FOR GUIDING THE YARN ONTO THE COIL BEING WOUND, COMPRISING A ROTARY YARN GUIDE OF GENERALLY CYLINDRICAL SHAPE HAVING A GUIDING GROOVE EXTENDING PERIPHERALLY ABOUT AND AXIALLY ALONG THE CYLINDRICAL GUIDE TO RECIPROCATE THE ONCOMING YARN ALONG THE COIL, SAID GROOVE FORMING A CURVE CLOSED UPON ITSELF AND DEFINING TWO AXIALLY SPACED REVERSING LOCATIONS RELATIVE TO THE RECIPROCATING YARN MOTION, TWO NORMALLY STATIONARY MEMBERS COVERING SAID RESPECTIVE REVERSING LOCALITIES IN FRONT OF SAID YARN GUIDE RELATIVE TO THE YARN TRAVEL AND BEING RADIALLY SPACED FROM SAID YARN GUIDE, SAID MEMBERS HAVING RESPECTIVE YARN DEFLECTOR EDGES FACING EACH OTHER AND EXTENDING TOWARD THE MIDDLE PORTION OF SAID YARN GUIDE AND BEING RESPECTIVELY PROVIDED WITH PROJECTIONS WHICH ARE MUTUALLY INTERPOSED TO JOINTLY FORM A ZIGZAG GAP IN FRONT OF SAID MIDDLE PORTION. 